Iceland is about 3.7 times smaller than Japan.

Japan is approximately 377,915 sq km, while Iceland is approximately 103,000 sq km, making Iceland 27.25% the size of Japan. Meanwhile, the population of Japan is ~125.5 million people (125.2 million fewer people live in Iceland).

This to-scale map shows a size comparison of Japan compared to Iceland. For more details, see an in-depth quality of life comparison of Iceland vs. Japan using our country comparison tool.

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